Leandeb g



(No Model.)

L. G. GILBERT.

COMBINED STOP AND CHECK VALVE.

No. 315,273. A

Patented Apr. '7, 1885.

Jvzf. Jj

lill! riUNrrn STATES FA.Ti12-ffii* OFFICE.-

LEANDER G. Gunnar, or BUFFALO, New Yoan.

COMBINED STOP AND CHECK VALVE.

SPECIFICATION forming part. of Letters Patent No. 315,273, dated April7, 1885.

Application niedmyiiss'i." (No modela To all whom it may concern:

Be it known that I, LEANDER G. GILBERT, of the city of Buffalo, in thecounty of Erie and State of New York, have invented new and usefulImprovements in Combined Stop and Check Valves, of which the followingis a specification.

rlhis invention relates to that class of valves which are designed to beused either as a stopvalve or as a check-valve, and in which aball orspherical valve is employed.

The object of my invention is to provide a valve of this character whichcan be readily changed from a stop-valve to a check-valve, or viceversa, and in which a perfectly steam or water tight joint is obtained.

My invention consists to that end of the improvements which will behereinafter fully set forth and pointed out in the claims.

In the accompanying drawings, Figure l represents a longitudinal sectionof my improvement, showing` the parts in position whereby the valve canbe used as a stop-valve. Fig. 2 is a similar viewshowing the parts inposition, so' that the valve can be used as a checkyalve. Fig. 3 is aside elevation of the valve and connecting parts removed from thevalve-casing. Fig. Li is a horizontal section in line x x, Fig. 1. Fig.is a horizontal section in line y y, Fig. 2.

Like Vletters of reference refer to like parts in the several figures.

A represents the valve-casing provided with the usual inlet and outletports c a.

B is the valve, and b the valve-seat formed in the casing A. The valveB-is of spherical form, and is preferably made of metal.

C is an open cylindrical cage surrounding the valve B, and arrangedvertically in the cylindrical enlargement A of the casing A. The cage Cconsists of an upper and a lower ring, c c', connected by vertical ribsc2, the lower ring, c,being provided with an inwardlyprojecting flange,which forms a seat for the valve when the cage is raised and retains thevalve within the cage. The upper ring, c, is provided with an internalscrew-thread,and is secured to a ring or cover, d.

D is a hollow stem secured to the ring d by suitable collars,d d2, andextending upwardly through a sleeve or cap, E, which closes thecylindrical enlargement A of the casing.` The n l E is closed at its top:by `a screw-nut, F,

which is provided with a suit-able packing, forming atight joint betweenthe bore of the sleeve E and the stem D in the usualmanner. The stem Dis provided above the collar d2 with an external screw-thread, g, andthe sleeve E is provided with an internal screwthread, h, which receivesthe thread g of the stem D. The latter is providedat its upper end witha suitable hand-wheel, H.`

I is a rod extending through the hollow stem D and providedfat its lowerend with a screwj thread, i, which works in an internal screwthread, j,formed in the stem D.

7c is a screw nut or cap secured to the top of the tubular stem D, andprovided with a suitable packing, whereby a tight joint is formedbetween the tubular stem and the rod I. The latter projects through thescrew-nut 7c, and is provided with a flattened head, i', to receive awrench or other suitabledevice for turning it. Vhen the rod I is screweddown so that its lower end bears upon thezvalve B, the latter is clampedbetween the rod I and the flange c3 at the lower end of thecage, and thevalve can be raised and lowered with the cage by turning the screw-stemD, and be opened and closed like an ordinary stop-valve.

When the valve is desired to be used as a checkwalve, the rod I isadjusted to clear the i Y valve, as shown in Fig. 2, when the valve isfree to move vertically in the cage G and seat itself automatically. Thecage C retains the ball in position above the valve-seat and preventsany lateral'movement or wedging ofthe valve in its seat. The valve Beanturn freely in the cage, and will constantly change its position in itsseat by the pressure of the steam or water against the valve when open.By this means any unequal wear of the valve is prevented, and aperfectly-tight fit of the valve in its seat is assured at all times.

I claim as my invention- 1. The combination,with a valve-casing, of

a cage provided with a valve-support, ia lstem attached to said cage, aball-valve ,arranged within the cage, and a locking-screw` whereby thevalve can be` secured in the cage against IOO said valvesupport,therebyenabling the valve to berlifted from its seat with the cage whendesired, substantially as set forth.

2. The combination, with a ball-valve and its casing, of a cage, C,provided with a valvesupport, and a tubular stem, D, attached to thecage, and a screw-rod, I, adapted to bear against the valveB,substantially as set forth.

3. The combination, with a ball-valve, B, and its casing, of a cage, C,provided with a valve-support, and inclosing said valve, a tubular stem,D, provided with an internal screw-thread, j, and a screw-rod, I,arranged Within the stem D,and adapted to bear against the valve B,substantially as set forth.

4. The combination, with the valve-casing A, having a cylindricalenlargement, A, and valve-seat b, of a cage, C, arranged in theenlargement A of the casing, and provided with a valve-support, ahall-valve, B, conned Within the cage C, screw-stem D, and screw-LEANDER G. GILBERT.

Vit-nesses:

JN0. J. BONNER, CARL F. GEYER.

